LXR linux/fs/ext2/xattr

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/fs/ext2/xattr_security.c
   4 * Handler for storing security labels as extended attributes.
   5 */
   6
   7#include "ext2.h"
   8#include <linux/security.h>
   9#include "xattr.h"
  10
  11static int
  12ext2_xattr_security_get(const struct xattr_handler *handler,
  13                        struct dentry *unused, struct inode *inode,
  14                        const char *name, void *buffer, size_t size)
  15{
  16        return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
  17                              buffer, size);
  18}
  19
  20static int
  21ext2_xattr_security_set(const struct xattr_handler *handler,
  22                        struct user_namespace *mnt_userns,
  23                        struct dentry *unused, struct inode *inode,
  24                        const char *name, const void *value,
  25                        size_t size, int flags)
  26{
  27        return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
  28                              value, size, flags);
  29}
  30
  31static int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
  32                           void *fs_info)
  33{
  34        const struct xattr *xattr;
  35        int err = 0;
  36
  37        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  38                err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
  39                                     xattr->name, xattr->value,
  40                                     xattr->value_len, 0);
  41                if (err < 0)
  42                        break;
  43        }
  44        return err;
  45}
  46
  47int
  48ext2_init_security(struct inode *inode, struct inode *dir,
  49                   const struct qstr *qstr)
  50{
  51        return security_inode_init_security(inode, dir, qstr,
  52                                            &ext2_initxattrs, NULL);
  53}
  54
  55const struct xattr_handler ext2_xattr_security_handler = {
  56        .prefix = XATTR_SECURITY_PREFIX,
  57        .get    = ext2_xattr_security_get,
  58        .set    = ext2_xattr_security_set,
  59};
  60